"...he was born without the organs for speech..."
Considering the two human organs required for speech are the brain & lungs, I don't understand how he could be alive without either of them.
Also, I can willingly suspend disbelief and buy that the Nintendo PowerGlove device tracks specific arm/hand movements and interprets them into audible words... But Amy the gorilla pretty much (or quite literally, actually) does the exact same motions for everything she "says". Makes no sense. But then again, nothing in this film really does.